chore(deps): upgrade @pkcprotocol/pkc-js 0.0.47 -> 0.0.48

[Rinse12]

Bump the pinned @pkcprotocol/pkc-js dependency from 0.0.47 to 0.0.48 (current latest on npm).

• Installed with --save-exact (project convention: exact versions).
• undici stays pinned at 8.4.1 (direct dep; the pkc-js body-timeout polyfill requires undici 8 — do not let the upgrade float it).
• Verify the full npm run test:cli suite passes locally before pushing, paying attention to the kubo restart-on-init behavior (pkc-js rewrites Routing config + POSTs /shutdown on first connect).

[Rinse12]

Done in 091566d (pushed to master). @pkcprotocol/pkc-js 0.0.47 -> 0.0.48 with --save-exact; undici stays pinned at 8.4.1. Full local test:cli green (39 files, 305 tests).